package com.sky.service.impl;

import com.fasterxml.jackson.databind.node.DoubleNode;
import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.entity.User;
import com.sky.mapper.OrdersMapper;
import com.sky.mapper.ReportMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import io.swagger.models.auth.In;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.xssf.usermodel.*;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.*;
import java.util.stream.Collectors;

/**
 * @author 杨振华
 * @since 2023/7/26
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Resource
    private ReportMapper reportMapper;

    @Resource
    private OrdersMapper ordersMapper;

    @Resource
    private UserMapper userMapper;

    @Resource
    private WorkspaceService workspaceService;

    /**
     * 获得营业额
     *
     * @param begin 开始
     * @param end   结束
     * @return {@link TurnoverReportVO}
     */
    @Override
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        log.info("营业额统计...");
        // 用于存放begin - end范围内的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            // 计算指定日期的后一天日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        String join = StringUtils.join(dateList, ",");

        // 存放每天营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            // 查询相应日期内的营业额
            LocalDateTime LdtBegin = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime LdtEnd = LocalDateTime.of(date, LocalTime.MAX);

            // select sum(amount) from orders
            // where order_time > ? and order_time < ? and status = ?
            Map map = new HashMap();
            map.put("begin",LdtBegin);
            map.put("end",LdtEnd);
            map.put("status", Orders.COMPLETED);
            Double turnOver = ordersMapper.sumByMap(map);

            turnOver = turnOver == null ? 0.0 : turnOver;

            turnoverList.add(turnOver);
        }

        return TurnoverReportVO
                .builder()
                .dateList(join)
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 统计用户数据
     *
     * @param begin 开始
     * @param end   结束
     * @return {@link UserReportVO}
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        log.info("用户数据统计...");
        // 用于存放begin - end范围内的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            // 计算指定日期的后一天日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        // 存放每天的新增用户数量
        // select count(id) from user where creat_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();
        // 存放每天的总用户数量
        // select count(id) from user where creat_time < ?
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            // 查询相应日期内的营业额
            LocalDateTime LdtBegin = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime LdtEnd = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("end",LdtEnd);
            Integer totalUser = userMapper.getCountUser(map);
            map.put("begin",LdtBegin);
            Integer newUser = userMapper.getCountUser(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    /**
     * 得到订单统计
     *
     * @param begin 开始
     * @param end   结束
     * @return {@link OrderReportVO}
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        log.info("订单统计....");
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        // select count(id) from orders where order_time < ? and order_time > ? and status = ?
        List<Integer> validOrderCountList = new ArrayList<>();
        // select count(id) from orders where order_time < ? and order_time > ?
        List<Integer> totalOrderList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime LdtBegin = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime LdtEnd = LocalDateTime.of(date, LocalTime.MAX);
            // 订单总数
            Integer total = getOrderCount(LdtBegin,LdtEnd,null);
            totalOrderList.add(total);

            // 订单有效数
            Integer affect = getOrderCount(LdtBegin,LdtEnd,Orders.COMPLETED);
            validOrderCountList.add(affect);
        }
        // 时间区间内的订单总数量
        Integer totalOrderCount = totalOrderList.stream().reduce(Integer::sum).get();

        // 时间区间内的有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;
        // 完成率
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount.doubleValue();
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(totalOrderList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 销量排名统计
     *
     * @param begin 开始
     * @param end   结束
     * @return {@link SalesTop10ReportVO}
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end){
        log.info("销量排名统计.....");
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> goodsSalesDTOList = ordersMapper.getSalesTop10(beginTime, endTime);

        String nameList = StringUtils.join
                (goodsSalesDTOList
                        .stream()
                        .map(GoodsSalesDTO::getName)
                        .collect(Collectors.toList()),",");
        String numberList = StringUtils.join
                (goodsSalesDTOList
                        .stream()
                        .map(GoodsSalesDTO::getNumber)
                        .collect(Collectors.toList()),",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 运营数据报表
     *
     * @param response 响应
     */
    /**导出近30天的运营数据报表
     * @param response
     **/
    public void exportBusinessData(HttpServletResponse response) {
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);
        //查询概览运营数据，提供给Excel模板文件
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin,LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //基于提供好的模板文件创建一个新的Excel表格对象
            XSSFWorkbook excel = new XSSFWorkbook(inputStream);
            //获得Excel文件中的一个Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            sheet.getRow(1).getCell(1).setCellValue(begin + "至" + end);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            //获取单元格
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());
            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i);
                //准备明细数据
                businessData = workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            XSSFCellStyle cellStyle = excel.createCellStyle();
            cellStyle.setAlignment(HorizontalAlignment.CENTER);
            cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
            XSSFRow row1 = sheet.getRow(1);
            XSSFCell cell = row1.getCell(1);
            cell.setCellStyle(cellStyle);
            //通过输出流将文件下载到客户端浏览器中
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //关闭资源
            out.flush();
            out.close();
            excel.close();

        }catch (IOException e){
            e.printStackTrace();
        }
    }

    /**
     * 根据时间区间统计指定状态的订单数量
     * @param beginTime
     * @param endTime
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
        Map map = new HashMap();
        map.put("status", status);
        map.put("begin",beginTime);
        map.put("end", endTime);
        return ordersMapper.countByMap(map);
    }
}
